Method and system for recovering volatile substances in wastewater

A technology for volatile substances and wastewater, which is applied in the field of recycling volatile substances in wastewater, can solve the problems of secondary pollution, poor cooling effect, high flow rate, etc., and achieve the effects of reducing the organic content of wastewater, facilitating condensation recovery, and high treatment efficiency

Pending Publication Date: 2022-06-24
JIANGSU QINGQUAN CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The concentration of organic matter in wastewater is high, which exceeds the processing load of the conventional "physicochemical-biochemical" wastewater treatment system of chemical enterprises. The traditional treatment method uses heating and rectification to separate low-boiling organic matter in wastewater, but this method has high energy consumption and waste water treatment. long cycle
[0003] Patent CN208200427U discloses a method for stripping dichloromethane in waste water (containing 2% to 10% dichloromethane in the waste water) and condensation recovery of dichloromethane, but the method has the following problems: first, waste water It needs to be preheated to 50-60°C, additional steam supply is required, and the energy consumption is high; secondly, the boiling point of dichloromethane is 39.8°C under the condition of normal pressure (102.18kpa). The high flow rate of condensable gas requires extremely high cooling effect of the condenser. Poor cooling effect will lead to the loss of dichloromethane with the waste gas; third, the traditional stripping method will generate a large amount of waste gas, and the boiling point of dichloromethane is low, which is prone to cause The problem of secondary pollution caused by incomplete condensation, waste gas containing dichloromethane cannot be directly processed into conventional regenerative incinerators, and additional waste gas treatment devices need to be added

Method used

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  • Method and system for recovering volatile substances in wastewater
  • Method and system for recovering volatile substances in wastewater
  • Method and system for recovering volatile substances in wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0059] The present embodiment provides a system and operation process for recovering volatile substances in waste water, and the specific details are as follows:

[0060] A system for recovering volatile substances in wastewater, comprising: stripping device, pressurizing device, condensing device and recovery device; wherein stripping device comprises waste water feed pump 11, waste water filter 12 and stripping tower 13, stripping device The tower 13 is composed of a skirt support 13011 and a tower body 1309; a waste water feed end 1304 is arranged in the upper part of the tower body 1309, a flow meter is arranged in front of the waste water feed end 1304, and the waste water feed end is connected to a nozzle-type water inlet distributor 1305; The stripping tower adopts regular corrugated metal mesh packing 1302. The gold mesh packing is provided with 2 to 4 layers according to the height of the tower. In this embodiment, three layers are set. The gold mesh packing 1302 is su...

Embodiment 2

[0070] The present embodiment provides a method for recovering methylene chloride in wastewater, which is realized by using the device provided in Example 1. The treatment object is the wastewater of a certain furan ammonium salt project, and the main component of the furan ammonium salt wastewater is 98.00 ~99.00wt% water, 0.8~1.5wt% dichloromethane, 0.03~0.05wt% furan ammonium salt, 0.05~0.08wt% furoic acid, 0.08~0.17wt% methoxyamine, 0.04~~0.20wt% other organic impurities . Specific steps are as follows:

[0071] S1: Open the gas condenser 31 to enter and exit the frozen brine, fill the liquid storage tank 42 with 0.70MPa (gauge pressure) nitrogen, and open the liquid inlet valve of the gas storage tank. Start the compressor 21. After the compressor 21 is fully started, open the inlet valve of the stripping tower 13, and adjust the nitrogen inlet flow to ensure that the tower pressure of the stripping tower 13 is between 0.01 and 0.02 MPa (gauge pressure). The gas runs st...

Embodiment 3

[0081] This embodiment provides a method for recovering 2-methyltetrahydrofuran in wastewater, which is realized by using the device provided in Example 1. The wastewater to be treated is the process wastewater of a certain 5-chloro-2-pentanone project. The main wastewater of this project is The ingredients are 91.5%-94.5% by weight of water, 5.0-8.0% by weight of 2-methyltetrahydrofuran, 0.3-0.5% by weight of 2-methylfuran, and 0.1-0.2% by weight of other organic impurities. Specific steps are as follows:

[0082] S1: Open the gas condenser to enter and exit the frozen brine, fill the liquid storage tank with 0.70MPa (gauge pressure) nitrogen, and open the air intake valve of the gas storage tank. Start the compressor. After the compressor is fully started, open the inlet valve of the stripping tower, and adjust the nitrogen inlet flow to ensure that the tower pressure of the stripping tower is between 0.01 and 0.02MPa (gauge pressure), and the gas runs stably for 10 minutes....

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Abstract

The invention provides a method and a system for recovering volatile substances in wastewater. According to the invention, wastewater and stripping gas are in full contact, so that organic matters are separated out; the separated organic matters are firstly pressurized and then condensed and recycled; the wastewater is in contact with stripping gas through the stripping tower, so that volatile substances in the wastewater are changed into gas, and the gas is pressurized and condensed into liquid to be recycled; and the air stripping gas internal circulation mode solves the problems of large waste gas generation amount and difficult waste gas treatment in the traditional air stripping method, and the air stripping condensed organic matters can be continuously recycled or sold as products, thereby creating economic value for enterprises.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a method and system for recovering volatile substances in wastewater. Background technique [0002] In the production process of chemical enterprises, wastewater containing volatile substances will be produced, and the volatile substances mainly include organic substances such as methylene chloride, furan, 2-methyltetrahydrofuran and methanol. The concentration of organic matter in wastewater is high, which exceeds the processing load of the conventional "physicochemical-biochemical" wastewater treatment system of chemical enterprises. The traditional treatment method adopts heating and rectification to separate low-boiling organic matter in wastewater, but this method has high energy consumption and wastewater treatment. long cycle. [0003] Patent CN208200427U discloses a method for stripping dichloromethane in waste water (containing 2% to 10% of dichloromethane in waste water)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/20B01J19/14F25J1/02B01D45/06C02F101/34C02F101/36C02F101/38C02F103/34
CPCC02F1/20B01J19/14B01D45/06F25J1/0228C02F2101/36C02F2101/38C02F2101/34C02F2103/34
Inventor 徐建军宋伟潘智伟李亚峰张俊郭家成
Owner JIANGSU QINGQUAN CHEM CO LTD
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